spi_flash(stm32spi_flash的编程)

1、本帖最后由orange-208 于 2012-5-28 10:05 编辑void SPI_Flash_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)SPI_FLASH_Write_SR(0x02);/ 使能状态寄存器中的写存储器SST25V_DBSY();SPI_FLASH_Write_SR(0x02);/ 使能状态寄存器中的写存储器SST25V_DBSY();实验目的：将数据写入外部FLASH 中，然后再读出来显示在LCD 上实验平台：基于STM32F103C8T6 的彩屏开发板FLASH ： SST25VF016B flash_SST

2、.c#include "flash_SST.h"#include "spi.h"#include "delay.h"/4Kbytes 为一个 Sector/16 个扇区为1 个 Block/SST25VF016B容量为2M字节，共有32个Block(块),512个Sector (扇区)/初始化SPI FLASH 的 IO 口/修改状态寄存器，允许芯片存储器被写void SPI_Flash_Init(void)RCC->APB2ENR|=1<<2; /PORTA 时钟使能GPIOA->CRH&=0XFFF

3、FFF0F;GPIOA->CRH|=0X00000030;/PA9 推挽GPIOA->ODR|=1<<9;/PA9 上拉SPIx_Init();/初始化SPISPI_FLASH_Write_SR(0x02); / 使能状态寄存器中的写存储器SST25V_DBSY();/读取SPI_FLASH 的状态寄存器/BIT7 65 4 3 2 1 0/SPR RV TB BP2 BP1 BP0 WEL BUSY/SPR:默认0,状态寄存器保护位，配合WP使用/TB,BP2,BP1,BP0:FLASH 区域写保护设置/WEL: 写使能锁定/BUSY: 忙标记位(1,忙 ;0,空闲)

4、/默认:0x00u8 SPI_Flash_ReadSR(void) u8 byte=0;SPI_FLASH_CS=0;/使能器件SPIx_ReadWriteByte(SST25_ReadStatusReg); /发送读取状态寄存器命令 byte=SPIx_ReadWriteByte(0Xff);/读取一个字节SPI_FLASH_CS=1;/取消片选return byte; /写 SPI_FLASH 状态寄存器/只有SPR,TB,BP2,BP1,BP0(bit 7,5,4,3,2) 可以写 !void SPI_FLASH_Write_SR(u8 sr) SPI_FLASH_CS=0;/片选SPI

5、x_ReadWriteByte(SST25_EnableWriteStatusReg); / 使能写状态寄存器命令SPI_FLASH_CS=1;/取消片选SPI_FLASH_CS=0;/片选SPIx_ReadWriteByte(SST25_WriteStatusReg); /发送写取状态寄存器命令SPIx_ReadWriteByte(sr);/写入一个字节SPI_FLASH_CS=1;/取消片选/SPI_FLASH 写使能/将 WEL 置位void SPI_FLASH_Write_Enable(void)SPI_FLASH_CS=0;/使能器件SPIx_ReadWriteByte(SST25_

6、WriteEnable); /发送写使能SPI_FLASH_CS=1;/取消片选 /SPI_FLASH 写禁止/将 WEL 清零void SPI_FLASH_Write_Disable(void)SPI_FLASH_CS=0;/使能器件SPIx_ReadWriteByte(SST25_WriteDisable); /发送写禁止指令SPI_FLASH_CS=1;/取消片选/读取芯片ID SST25VF016 的是 0XBF41u16 SPI_Flash_ReadID(void)14u16 Temp = 0;SPI_FLASH_CS=0;/发送读取ID 命令SPIx_ReadWriteByte(0

7、x90);/发送24 位的地址SPIx_ReadWriteByte(0x00);SPIx_ReadWriteByte(0x00);SPIx_ReadWriteByte(0x00);/读取返回的16 位值Temp=SPIx_ReadWriteByte(0xFF)<<8; / 高 8 位数据Temp+=SPIx_ReadWriteByte(0xFF);/底八位数据SPI_FLASH_CS=1;return Temp;/读取SPI FLASH/在指定地址开始读取指定长度的数据/pBuffer: 数据存储区/ReadAddr: 开始读取的地址(24bit)/NumByteToRead: 要

8、读取的字节数(最大65535 即 64k)void SPI_Flash_Read(u8* pBuffer,u32 ReadAddr,u16 NumByteToRead)u16 i;SPI_FLASH_CS=0;/使能器件SPIx_ReadWriteByte(SST25_ReadData);/发送读取命令/发送24bit 地址SPIx_ReadWriteByte(u8)(ReadAddr)>>16);SPIx_ReadWriteByte(u8)(ReadAddr)>>8);SPIx_ReadWriteByte(u8)ReadAddr);for(i=0;i<NumBy

9、teToRead;i+)pBuffer=SPIx_ReadWriteByte(0XFF);/循环读数SPI_FLASH_CS=1;/取消片选/地址自动增加的写数据Avoid AutoAddressIncrement_WordProgramA(u8 Byte1, u8 Byte2, u32 Addr) SPI_FLASH_Write_Enable();SPI_FLASH_CS=0;SPIx_ReadWriteByte(SST25_AAI_WordProgram);/输入所要写数据的起始地址SPIx_ReadWriteByte(Addr & 0xFF0000) >> 16);S

10、PIx_ReadWriteByte(Addr & 0xFF00) >> 8);SPIx_ReadWriteByte(Addr & 0xFF);/发送最初的两个数据SPIx_ReadWriteByte(Byte1);SPIx_ReadWriteByte(Byte2);SPI_FLASH_CS=1;SPI_Flash_Wait_Busy();/地址自动增加的写数据Bvoid AutoAddressIncrement_WordProgramB(u8 state,u8 Byte1, u8 Byte2)SPI_FLASH_Write_Enable();SPI_FLASH_CS

11、=0;SPIx_ReadWriteByte(SST25_AAI_WordProgram);SPIx_ReadWriteByte(Byte1);SPIx_ReadWriteByte(Byte2);SPI_FLASH_CS=1;SPI_Flash_Wait_Busy();if(state=1)SPI_FLASH_Write_Disable();SPI_Flash_Wait_Busy();/结合AB 构成的地址自动增加的连续数据的写入/具有先擦除待写区域的功能/pBuffer ：为待写数据组/WriteAddr ：所写数据的起始地址/NumByteToWrite ：所要写的数据的长度void SPI

12、_Flash_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)u16 i,temp;u32 secpos;u16 secoff;u16 secremain;/以下代码为擦除待写区域的代码SST25VF016secpos=WriteAddr/4096;/扇区(4K)地址 0511 forsecoff=WriteAddr96;secremain=4096-secoff;if(NumByteToWrite<secremain)temp=1;elsei=NumByteToWrite-secremain;if(i%96=0)temp=i/409

13、6+1;elsetemp=i/4096+2;for(i=0;i<temp;i+)SPI_Flash_Erase_Sector(secpos+i)*4096);/以下代码为将数据写入指定地址的代码if(NumByteToWrite%2=0)temp=NumByteToWrite/2-1;else/在扇区内的偏移/扇区剩余空间大小/剩余空间大于所存数据/剩余空间小于所存数据/判断还占了几个扇区/擦除将要写入数据的扇区temp=NumByteToWrite/2;/开AutoAddressIncrement_WordProgramA(pBuffer0, pBuffer1,WriteAddr );

14、 始写数据for(i=1;i<temp;i+)AutoAddressIncrement_WordProgramB(0,pBuffer2*i, pBuffer2*i+1);if(NumByteToWrite%2=0)/结束AutoAddressIncrement_WordProgramB(1,pBufferNumByteToWrite-2, pBufferNumByteToWrite-1);写数据else/结AutoAddressIncrement_WordProgramB(1,pBufferNumByteToWrite-1,0);束写数据/写入1Byte 数据/pBuffer: 待写的数

15、据/WriteAddr ：待写数据的地址void Flash_WriteByte(u8* pBuffer,u32 WriteAddr) u32 secpos;secpos=WriteAddr/4096;SPI_Flash_Erase_Sector(secpos);SPI_FLASH_Write_Enable();SPI_FLASH_CS=0;SPIx_ReadWriteByte(SST25_ByteProgram );/发送24bit 地址SPIx_ReadWriteByte(u8)(WriteAddr)>>16);SPIx_ReadWriteByte(u8)(WriteAddr)

16、>>8);SPIx_ReadWriteByte(u8)WriteAddr);SPIx_ReadWriteByte(pBuffer0);SPI_FLASH_CS=1;SPI_Flash_Wait_Busy();/擦除整个芯片/整片擦除时间:/W25X16:25s/W25X32:40s/W25X64:40s/等待时间超长.void SPI_Flash_Erase_Chip(void)SPI_FLASH_Write_Enable();SPI_Flash_Wait_Busy();SPI_FLASH_CS=0;SPIx_ReadWriteByte(SST25_ChipErase);SPI_F

17、LASH_CS=1;SPI_Flash_Wait_Busy();/擦除一个扇区/Dst_Addr: 扇区地址0511 for w25x16/擦除一个山区的最少时间:150msvoid SPI_Flash_Erase_Sector(u32 Dst_Addr)SPI_FLASH_Write_Enable();SPI_Flash_Wait_Busy();/扇区地址0511 for w25x16 4096=4k/擦除这个扇区/SET WEL/使能器件/发送写页命令/发送待写的数据/等待写完成/SET WEL/使能器件/发送片擦除命令/取消片选/等待芯片擦除结束/SET WELSPI_FLASH_CS=

18、0;SPIx_ReadWriteByte(SST25_4KByte_BlockERASE);/使能器件/发送扇区擦除指令SPIx_ReadWriteByte(u8)(Dst_Addr)>>16);SPIx_ReadWriteByte(u8)(Dst_Addr)>>8);SPIx_ReadWriteByte(u8)Dst_Addr);SPI_FLASH_CS=1;SPI_Flash_Wait_Busy();/发送 24bit 地址/取消片选/等待擦除完成/等待空闲void SPI_Flash_Wait_Busy(void)while (SPI_Flash_ReadSR()

19、&0x01)=0x01);/ 等待 BUSY 位清空void SST25V_EBSY(void)SPI_FLASH_CS=0;SPIx_ReadWriteByte( SST25_EBSY);SPI_FLASH_CS=1;void SST25V_DBSY(void)SPI_FLASH_CS=0;SPIx_ReadWriteByte( SST25_DBSY);SPI_FLASH_CS=1;Flash.h#ifndef _FLASH_SST_H#define _FLASH_SST_H#include "sys.h"#defineSPI_FLASH_CS PAout(9)/

20、选中FLASH#define FLASHID 0XBF41/SST25VF016 读写/指令表#define SST25_ReadData0x03#define SST25_FastReadData0x0B#define SST25_4KByte_BlockERASE0x20#define SST25_32KByte_BlockErase0x52#define SST25_64KByte_BlockErase0xD8#define SST25_ChipErase0xC7#define SST25_ByteProgram0x02#define SST25_AAI_WordProgram0xAD#

21、define SST25_ReadStatusReg0x05#define SST25_EnableWriteStatusReg0x50#define SST25_WriteStatusReg0x01#define SST25_WriteEnable0x06#define SST25_WriteDisable0x04#define SST25_ManufactDeviceID0x90#define SST25_JedecDeviceID0x9F#define SST25_EBSY0x70#define SST25_DBSY0x80 void SPI_Flash_Init(void);u16 S

22、PI_Flash_ReadID(void);/读取FLASH IDu8 SPI_Flash_ReadSR(void);/读取状态寄存器void SPI_FLASH_Write_SR(u8 sr);/写状态寄存器void SPI_FLASH_Write_Enable(void);/写使能void SPI_FLASH_Write_Disable(void);/写保护void SPI_Flash_Read(u8* pBuffer,u32 ReadAddr,u16 NumByteToRead); /读取 flashvoid SPI_Flash_Erase_Chip(void);/整片擦除void SP

23、I_Flash_Erase_Sector(u32 Dst_Addr);/扇区擦除void SPI_Flash_Wait_Busy(void);/等待空闲void SST25V_EBSY(void);void SST25V_DBSY(void);void Flash_WriteByte(u8* pBuffer,u32 WriteAddr);/写入 1Byte 数据void AutoAddressIncrement_WordProgramA(u8 Byte1, u8 Byte2, u32 Addr); / 地址自动增加的写数据Avoid AutoAddressIncrement_WordProgr

24、amB(u8 state,u8 Byte1, u8 Byte2);/地址自动增加的写数据Bvoid SPI_Flash_Write(u8 pBuffer,u32 WriteAddr,u16 NumByteToWrite);/结合AB 构成的地址自动增加的连续数据的写入#endif main.c主函数：#include<stm32f10x_lib.h>#include"common.h"#include"TFTLCD.h"#include"spi.h"#include"key.h"#include&quo

25、t;flash.h"const u8 TEXT_Buffer="Chen An SST25VF"#define SIZE sizeof(TEXT_Buffer)int main(void)/待写入flash 的数据/计算待写入数据的长度u8 key;u8 datatempSIZE;Stm32_Clock_Init(9);delay_init(72);LCD_Init();KEY_Init();SPI_Flash_Init();POINT_COLOR=RED;while(SPI_Flash_ReadID()!=FLASH_ID)/开辟空间用于存放从flash 读回的数据/系统时钟初始化/延时函数的初始化/LCD 初始化/按键初始化/SPI 关于 flash 的硬件接口初始化/设置字体颜色/检验 flash 是否存在LCD_ShowString(60,130,"SST25VF Check Failed!"); delay_ms(500);LCD_ShowString(60,130,"SST25VF Ready!");LCD_ShowString